Lots of luck.

Maybe you already know this, but the concept of the Trinity, as I recall, was formulated by Augustine, the bishop of Hippo in north Africa when it was still part of the late Roman Empire. Augustine also is credited with formulating the concept of original sin, plus the idea of a "just war" and even "divine predestination."

The Trinity is ingrained in mainline Christian faiths now, but it's hard to call it precisely Biblical, since it's an interpretation by someone trying to put his own arms around what then were relatively new ideas. I always suspect that's why people teaching Bible classes have to try to figure it out in the same way you're doing now. It's not like you can pull up the words of Christ and say, "This is how he explained it." Paul was born and died before Augustine's time. The word "trinity" doesn't appear in the Bible.

The idea of the Trinity became codified, so to speak, with the adoption of the Nicene Creed by the early bishops of the then nondenominational church.

Ever since then, Biblical scholars and Sunday School teachers have been trying to figure out a way to explain it. Some fall back on the old egg analogy -- the shell, the white and the yolk -- which any skeptical 11-year-old can pretty easily pick apart.

A good book that gets into Augustine's thinking and the evolution of European Christianity is How The Irish Saved Civilization. St. Patrick and Augustine lived at about the same time.